同时同频全双工场景中的射频域自适应干扰抵消

发布时间：2018-10-20 12:01

【摘要】：考虑同时同频全双工无线收发信机的射频域自干扰抵消技术,现有研究多集中于利用手动方式调整自干扰估计信号的参数。针对这一问题,该文提出一种射频域的自适应干扰抵消算法。以正交、同相参考支路构成的自干扰估计结构为基础,利用梯度下降法搜索支路的最优权矢量,估计出自干扰信号,实现了射频域的自适应干扰抵消,并且给出了该算法的收敛性分析。分析与仿真表明,当迭代步长越大或统计时间越短时,算法的收敛速度越小。在100倍符号周期的统计时间,0.3的归一化步长,80 dB干信比以及0 dB信噪比的仿真条件下,该文提出的射频域自适应干扰抵消算法可以实现约100 dB的自干扰抑制。
[Abstract]:Considering the simultaneous frequency full-duplex wireless transceiver radio frequency domain self-interference cancellation technology, most of the existing researches focus on adjusting the parameters of the self-interference estimation signal by manual method. To solve this problem, an adaptive interference cancellation algorithm in RF domain is proposed. Based on the self-interference estimation structure of orthogonal and in-phase reference branch, the gradient descent method is used to search the optimal weight vector of the branch to estimate the self-interference signal and realize adaptive interference cancellation in RF domain. The convergence analysis of the algorithm is given. The analysis and simulation show that the convergence speed of the algorithm is smaller when the step size of the iteration is larger or the statistical time is shorter. Under the conditions of statistical time of 100 times symbol period, normalized step size of 0. 3, 80 dB dry signal ratio and 0 dB signal-to-noise ratio, the proposed adaptive interference cancellation algorithm in radio frequency domain can achieve self interference suppression of about 100 dB.
【作者单位】：电子科技大学通信抗干扰技术国家级重点实验室;西华大学电气信息学院;
【基金】：国家自然科学基金(U1035002/L05,61001087,61101034,61271164) 国家科技重大专项(2011ZX03003010-003,2014ZX03003001-002) 四川省教育厅重点项目(12ZA161)资助课题
【分类号】：TN929.5

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